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Analog Devices Inc. LTC2918CDDB-B1#TRMPBF
- Part No.:
- LTC2918CDDB-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918CDDB-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2918CDDB-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds, fixed –5% tolerance, and windowed watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and delivers reliable reset assertion for microprocessor-based automotive control systems.
For engineers reviewing the LTC2918CDDB-B1#TRMPBF datasheet, LTC2918CDDB-B1#TRMPBF pinout, LTC2918CDDB-B1#TRMPBF application, or LTC2918CDDB-B1#TRMPBF equivalent, key selection criteria include its B1-version windowed watchdog timing (tWDL = 50ms, tWDU = 1.6s), manual reset interface compatibility, DFN-10 (3mm × 2mm) package footprint, and guaranteed RST operation down to VCC ≥ 0.8V.
Technical Context
The LTC2918CDDB-B1#TRMPBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine internally programmed thresholds selected via SEL1/SEL2 three-state inputs, while a dedicated windowed watchdog logic block validates WDI falling-edge timing between lower (50ms) and upper (1.6s) boundaries. Its fixed –5% tolerance eliminates TOL pin usage versus LTC2917 variants.
Reset timeout is configurable via RT pin (200ms internal when tied to VCC, adjustable with external capacitor), and RST output is open-drain with guaranteed low-voltage operation (VOL ≤ 0.2V at 15μA, VCC = 0.8V). The device integrates a 6.2V shunt regulator on VCC for high-voltage supply compatibility up to 12V with series resistor limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; supports up to 12V via internal 6.2V shunt regulator with external current-limiting resistor |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to 125°C), ensuring reliable trip point margining against supply tolerances |
| Quiescent Current | 30μA typical, enabling long-battery-life applications in always-on monitoring circuits |
| Watchdog Type | Windowed (B1 version): requires WDI falling edges strictly between 50ms (tWDL) and 1.6s (tWDU) to prevent false reset |
| Reset Timeout | 200ms internal when RT = VCC; adjustable from ~400μs to >20ms using external capacitor (CRT) |
| VCC Undervoltage Lockout | Guaranteed operation starts at VCC ≥ 0.8V; RST asserted low until VCC exceeds 1.5V UVLO threshold |
| Package | 10-lead (3mm × 2mm) plastic DFN with exposed pad; compatible with automated SMT assembly and thermal management |
Pinout & Package
Package: 10-Lead (3mm × 2mm) Plastic DFN with exposed pad (pin 11), rated for operation from 0°C to 70°C (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Device ground reference | Primary return path for all internal circuitry; must be connected to system ground plane for stable operation |
| MR (Pin 2) | Manual reset input (active-low) | Internally pulled up to VCC (100kΩ); accepts push-button interface without external components; initiates reset when pulled low |
| SEL2 (Pin 3) | Threshold selection input | Three-state (VCC/GND/open) control for nominal voltage selection; determines 1 of 9 monitor thresholds with SEL1 |
| SEL1 (Pin 4) | Threshold selection input | Three-state (VCC/GND/open) control paired with SEL2 to select 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, or ADJ (0.5V) threshold |
| VM (Pin 5) | Monitored supply input | High-impedance comparator input; compares against selected threshold; supports external resistive divider for ADJ mode |
| RST (Pin 6) | Open-drain reset output | Asserts low during fault or reset timeout; requires external pull-up; drives logic-level reset to μP or FPGA |
| RT (Pin 7) | Reset timeout control | Configures internal timer: open = ~400μs, VCC = ~200ms, capacitor-to-GND = adjustable (9ms/nF scaling) |
| WT (Pin 8) | Watchdog timeout control | Configures windowed watchdog: open = ~3.2ms, VCC = ~1.6s, capacitor-to-GND = adjustable (72ms/nF scaling) |
| WDI (Pin 9) | Watchdog input | Falling-edge sensitive only (B1 version); must toggle within 50ms–1.6s window to avoid RST assertion |
| VCC (Pin 10) | Power supply input | Accepts 1.5V–5.5V directly; includes 6.2V shunt regulator for >5.7V supplies; bypass with 0.1μF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| 9 Selectable Thresholds | Enables single-part support for 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V) supplies without external resistors |
| Windowed Watchdog (B1) | Prevents spurious resets by requiring WDI falling edges strictly between 50ms and 1.6s - critical for safety-critical automotive firmware validation |
| Manual Reset Input (MR) | Integrated 100kΩ pull-up enables direct push-button connection; eliminates external bias components and simplifies board layout |
| Glitch Immunity | Combines 10μs minimum glitch rejection (tUV) with programmable reset timeout to suppress transients without compromising threshold accuracy |
| Extended Temperature Range | Rated for 0°C to 70°C operation (C-grade), validated for industrial and automotive under-hood environments with thermal derating |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V power rail supplying MCU and CAN transceiver in engine bay environment subject to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset and windowed watchdog ensures deterministic system recovery after brownout or software hang. Use Value: ±1.5% threshold accuracy prevents nuisance resets during normal 5V±5% operation; 125°C-rated design ensures reliability at junction temperatures up to 125°C. | Use Scenario: Supervising 3.3V logic supply powering FPGA configuration memory and real-time Ethernet PHY in factory automation controller. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and continuous watchdog validation of firmware execution loop. Use Value: Windowed watchdog (50ms–1.6s) detects both stuck loops and excessively fast polling; MR pin allows field-service reset without power cycling. |
| Telecom Base Station Power Management | Medical Diagnostic Imaging Subsystem |
Use Scenario: Monitoring 12V intermediate bus feeding isolated DC-DC converters in 5G radio unit with strict uptime requirements. IC Role / Device Role / Timing Role: High-voltage supervisor leveraging internal 6.2V shunt regulator to derive local 3.3V logic supply while supervising 12V input. Use Value: Eliminates need for external LDO or Zener; 30μA quiescent current minimizes standby power loss across thousands of deployed units. | Use Scenario: Ensuring safe power sequencing and runtime integrity of 1.8V core supply for image processing ASIC in MRI subsystem. IC Role / Device Role / Timing Role: Precision supervisor with ADJ mode configured via external resistor divider to match exact ASIC voltage tolerance spec. Use Value: Adjustable threshold (0.5V reference) enables custom trip points; ±1.5% accuracy guarantees compliance with IEC 62304 safety-critical reset requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3+T | Fixed 2.93V threshold; no manual reset; no windowed watchdog; 3-pin SOT23 package | Suitable only for single-rail monitoring where adjustable thresholds and MR are unnecessary | Select when cost and board space are primary constraints and system requires only basic 2.93V supervision |
| TPS3808G33DBVR | Fixed 3.3V threshold; no manual reset; standard (non-windowed) watchdog; 6-pin SOT23 | Lacks windowed watchdog and MR; limited to 3.3V rail monitoring without flexibility | Choose for simple 3.3V microcontroller reset where extended timing validation is not required |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918CDDB-B1#TRMPBF provides unique value through its 9-threshold configurability, integrated manual reset, and B1-version windowed watchdog - making it the only option among the three capable of supporting multi-rail systems with stringent functional safety timing requirements.
Availability
LTC2918CDDB-B1#TRMPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLC modules, telecom base station power management, and medical diagnostic imaging subsystems requiring stable component supply and long-term lifecycle support.
Supply support for LTC2918CDDB-B1#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2918 belongs to ADI's precision voltage supervisor product line, designed specifically for mission-critical power monitoring in harsh environments where reliability, accuracy, and watchdog robustness are non-negotiable.
FAQ
What is the function of the MR pin on the LTC2918CDDB-B1#TRMPBF?
The MR (Manual Reset) pin on the LTC2918CDDB-B1#TRMPBF is an active-low input with an internal 100kΩ pull-up to VCC. When pulled low, it forces the RST output low for the full reset timeout period (e.g., 200ms if RT = VCC), then releases RST high. This enables push-button reset functionality without external components. The LTC2918CDDB-B1#TRMPBF is the only variant in the LTC2917/LTC2918 family that includes MR - the LTC2917 lacks this pin entirely.
How does the windowed watchdog feature work in the LTC2918CDDB-B1#TRMPBF?
The LTC2918CDDB-B1#TRMPBF implements a windowed watchdog requiring WDI falling edges to occur strictly between the lower boundary (tWDL = 50ms) and upper boundary (tWDU = 1.6s) - unlike standard watchdogs that only enforce an upper limit. If a falling edge arrives too early (<50ms) or too late (>1.6s), RST asserts low. This prevents both stuck-loop and runaway-timer failures. The LTC2918CDDB-B1#TRMPBF uses only falling edges for detection, per its B1 revision specification.
Can the LTC2918CDDB-B1#TRMPBF monitor a 12V supply directly?
Yes - the LTC2918CDDB-B1#TRMPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V input) must be placed between the 12V source and VCC to keep input current ≤5mA. The VM pin then monitors the 12V rail directly, with SEL1/SEL2 set to VCC/VCC to select the 12V threshold. This eliminates need for external level-shifting circuitry.
What is the minimum VCC voltage required for reliable operation of the LTC2918CDDB-B1#TRMPBF?
The LTC2918CDDB-B1#TRMPBF guarantees RST assertion for VCC ≥ 0.8V and exits undervoltage lockout once VCC exceeds 1.5V. Below 0.8V, RST behavior is not specified. For full functionality - including accurate threshold comparison, watchdog timing, and MR response - VCC must be ≥1.5V. The device draws only 30μA typical at 2.5V, enabling operation even in ultra-low-power wake-up circuits.
How do I configure the LTC2918CDDB-B1#TRMPBF to monitor a custom voltage like 2.1V?
To monitor 2.1V, configure the LTC2918CDDB-B1#TRMPBF in ADJ (adjustable) mode: tie SEL1 and SEL2 to GND/GND, then connect VM to a resistive divider between the 2.1V rail and GND. Size R1 and R2 so VM = 0.5V when the rail is at nominal 2.1V (e.g., R1 = 49.9kΩ, R2 ≈ 110kΩ). The internal comparator references 0.5V ±1.5%, yielding a final trip point of 2.1V ±1.5% - matching typical ASIC supply tolerances. The LTC2918CDDB-B1#TRMPBF's ±1.5% accuracy ensures this remains valid across –40°C to 125°C.
LTC2918CDDB-B1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918CDDB-B1#TRMPBF FAQ
1.How can I place an order for LTC2918CDDB-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CDDB-B1#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2918CDDB-B1#TRMPBF reliable?
The price and inventory of LTC2918CDDB-B1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918CDDB-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CDDB-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CDDB-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CDDB-B1#TRMPBF?
LTC2918CDDB-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CDDB-B1#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2918CDDB-B1#TRMPBF?
For technical support, including LTC2918CDDB-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CDDB-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918CDDB-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CDDB-B1#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2918CDDB-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CDDB-B1#TRMPBF?
All LTC2918CDDB-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CDDB-B1#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2918CDDB-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918CDDB-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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